Effect of Methoxyl Group Position on the Regioselectivity of Ammonia Substitution Reactions Involving 3,3‘-Dichloro-2,2‘-binaphthoquinones
作者:Kenneth W. Stagliano、Zhenhai Lu、Ashkan Emadi、John S. Harwood、Cynthia A. Harwood
DOI:10.1021/jo049713g
日期:2004.7.1
3‘-dichloro-2,2‘-binaphthoquinones 2 were prepared and evaluated for regioselectivity in ammonia substitution reactions. Biquinone 2b underwent regiospecific amination at the unsubstituted chloronaphthoquinone unit whereas the isomeric biquinone, 2c, produced moderate regioselectivity (85:15). Biquinone 2d, however, showed no level of regioselectivity demonstrating that the position of the methoxyl group influences
制备了一系列甲氧基取代的3,3'-二氯-2,2'-联萘醌2,并评估了氨取代反应中的区域选择性。联苯醌2b在未取代的氯萘醌单元上进行了区域特异性胺化,而异构联苯醌2c产生了中等的区域选择性(85:15)。然而,联苯醌2d没有显示出区域选择性的水平,表明甲氧基的位置会影响区域化学。联醌5中的分子内氢键改变了区域选择性。半经验计算表明,在进行优先取代的氯化碳上,LUMO系数相对较大。